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Flask in rosnode can't be terminated by control + C

asked 2020-03-10 16:15:36 -0500

yuheng gravatar image

I try to run flask code in ros like this. Every thing seems good until I try to terminate it by press Contrl + C. But it didn't work... Is there anyone know what's the problem or anyway I can terminate it?

if __name__ == '__main__':
    parser = ROSArgparse(relative='client/')
    args = parser.parse_args()
    client = InteractionClient(args)
    app = Flask(__name__)

    def image(idx):
        ###The view function for sending images with id
        arr = load_image(idx)
        img = Image.fromarray((arr*255).astype('uint8'))
        # create file-object in memory
        file_object = io.BytesIO()
        # write PNG in file-object, 'PNG')
        # move to beginning of file so `send_file()` it will read from start
        return send_file(file_object, mimetype='image/PNG')
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This is a flask problem not a ROS problem

stevemacenski gravatar image stevemacenski  ( 2020-03-10 16:33:19 -0500 )edit

1 Answer

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answered 2021-08-12 21:03:30 -0500

Rufus gravatar image

You should disable signal handling by ROS so that the flask app can receive the signal and terminate properly.

Replace your rospy.init_node with this

rospy.init_node("client", disable_signals=True)
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Asked: 2020-03-10 16:15:36 -0500

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Last updated: Aug 12 '21